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Launch Configurations

A launch configuration is an instance configuration template that an
Auto Scaling group uses to launch EC2 instances. When you create a launch configuration,
you specify
information for the instances. Include the ID of the Amazon Machine Image (AMI), the
instance type, a key pair, one or more security groups, and a block device mapping.
If
you've launched an EC2 instance before, you specified the same information in order
to
launch the instance.

You can specify your launch configuration with multiple Auto Scaling groups. However,
you can only
specify one launch configuration for an Auto Scaling group at a time, and you can't
modify a launch
configuration after you've created it. To change the launch configuration for an Auto
Scaling group,
you must create a launch configuration and then update your Auto Scaling group with
it.

Keep in mind that whenever you create an Auto Scaling group, you must specify a launch
configuration, a launch template, or an EC2 instance. When you create an Auto Scaling
group using an
EC2 instance, Amazon EC2 Auto Scaling automatically creates a launch configuration
for you and associates
it with the Auto Scaling group. For more information, see Creating an Auto Scaling Group Using an EC2
Instance. Alternatively, if you are using launch
templates, you can specify a launch template instead of a launch configuration or
an EC2
instance. For more information, see Launch Templates.